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High Energy Frontier in HEP

• Next projects on the HEP
  roadmap()
• Large Hadron Collider LHC at CERN
• Approved, budget in place and under construction
  
• Expected turn on in 2007
• Linear Collider (LC) ?
• Not approved yet/no budget yet/not sited yet.
• Expected turn on gt2014
• Study groups in Europe, Americas and Asia (world
  wide study)
• In Europe up to then little contact between
  experimental- communities of the two projects
  (?miss understandings)
• ?Initiative to form a LHC/LC common study
  group in 2002

() other projects like muon collider or VLHC on
longer time scale
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The LHC/LC study group

• Aim of the LHC/LC Study group investigate
  how the analyses at the LHC could profit from
  results obtained at the LC and vice versa maybe
  even affect LHC running or triggers --
• Started in summer 2002 as a world wide effort
• Collaborative effort of the LHC and linear
  collider community.
• Study group which has been officially recognized
  by international linear collider steering
  committee (ILCSC)
• Current about 190 (interested) working group
  members from ATLAS, CMS, LC working groups
  Tevatron contact person
• Working group coordinators R. Godbole, F. Paige,
  G. Weiglein
• Web page
• First document with results so far is being
  prepared

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The LHC/LC study

• Physics case well established for the LHC and LC
• Not the aim to see who is better (always tempting
  of course)
• One of the purposes is to make both communities
  aware when
• designing there analyses on what kind of
  additional information
• they might get when a LC kicks in
• Interplay between LHC and a LC can happen at
  different levels
• Combined interpretation of LHC/LC data
• ?In particular to reduce possible model
  dependencies
• LHC ? LC ? LHC LC
• Combined analyses of LHC and LC
• LHC ? LC ? LHC ? LC
• If a LC gets into operation in time, could even
  influence detector/trigger choices at LHC
  upgrades (time-of-flight, softer scales, particle
  ID,)
• ? Can help to make the case for concurrent
  running of LHC and a LC

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LHC Status/plans

• Date for first beams/collisions ?
  Spring 2007
• Initial physics run starts in summer/fall 2007
• ? collect 10 fb-1 /exp (2.1033cm-2
  s-1) by early 2008
• Depending on the evolution of the machine
• ? collect 200-300 fb-1 /exp
  (3.4-10.1033cm-2 s-1 ) in 5-6 years time

Already time to think of upgrading the machine
Two options presently discussed/studied

• Higher luminosity 1035cm-2 s-1 (SLHC)
• Needs changes in machine and and particularly in
  the detectors
• ? Start change to SLHC mode some time 2013-2016
• ?? Collect 3000 fb-1/experiment in 3-4 years
  data taking.

• Higher energy?
• LHC can reach ?s 15 TeV with present magnets
  (9T field)
• ?s of 28 (25) TeV needs 17 (15) T magnets ? RD
  needed!

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LHC/LC studies

• Electroweak Symmetry breaking (weakly)
• H. Haber, R.
  Godbole, G. Weiglein, ADR ()
• Strong Electroweak Symmetry breaking
• T. Barklow, K.
  Moenig
• Supersymmetric Models
• K. Desch K.
  Kawagoe, M. Nijori, F. Paige, G. Pollesello
• New Gauge Theories
• S. Riemann
• Models with Extra Dimensions
• J. Hewett
• Exotics
• J. Gunion
• Electroweak and QCD precision tests
• E. Boos, S.
  Heinemeyer, J. Stirling, ADR
• () main chapter editors/organizers

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1. Supersymmetry
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Stop/Sbottom mixing angles
Determination of ?b from
with/without exp systematics
Determination of ?stop,mstop when ?b is known
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2. Higgs Physics
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Top Yukawa Coupling
Includes 25 systematic for LHC meas.
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3. New Gauge Theories
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New Gauge Theories
Bourlikov, Godfrey, Hewett, Richard, Riemann,
Rizzo
Discover of an extra gauge boson at the LHC?
measure the mass Mass at LHC precision LC
measurements Allows to determine the couplings
and distinguish between different scenarios
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4. Extra Dimensions
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Curved Space RS Extra Dimensions
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more

• Lots more on
• Electroweak physics
• QCD
• Top physics
• ADD extra dimensions
• CP studies in the Higgs sector
• Higgs potential
• NMSSM studies
• Little Higgs studies
• Invisible Higgs
• Contact interactions
• etc etc.

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Summary

• Topics covered here just a small survey. Many
  more examples in the summary document, to appear
  (in as few months time)
• Expect the first document to be a basis for
  future work, summarize where we are and give
  guidance for future studies
• LHC/LC study group started relatively recently
  only scratched the surface so far.
• Several studies still need to be worked out
  quantitatively
• Certainly more ideas will come when we think a
  bit harder.
• If you have any, please do
  join us.
• Positive outcome is good synergy between LHC and
  LC enthousiasts
• .
• LHC/LC is a rich field
  (and a lot of fun)

Many thanks to G. Weiglein